There's a photo in the TV anime that shows baby Integra in the arms of a woman in a sari. And since Integra's skin is darker than her father's, we know her mom has to be some dark-skinned ethnicity. So presumably the woman in the photo is her mother.

Really well caught. I've watched the anime 3 times at least, but never noticed these details on the side. But not noticing the details, means I have missed crucial things stuck in there by the animators. Photo of a woman in a sari might take 0.5 seconds of airtime, but it takes at least 10 minutes to draw so it is no casual afterthought.